In a move to diversify its services, San Francisco-based mobile payments startup Square acquired BookFresh, an online appointment booking service that's been described as "the OpenTable for everything but restaurants." 

Terms of the deal were not disclosed. According to Re/code, BookFresh's software could be used to help customers book appointments with businesses.

Eventually businesses also could work with Square to let customers prepay for services such as hair salon visits or pet grooming. Beyond that, Square could also charge customers fees for securing appointments during holidays and other peak business periods.

Jack Dorsey's company reportedly is also testing a new mobile app called Square Pickup that lets people order take-out food from Square merchants. And last year, the company began offering a custom-built iPad stand for customers using its point-of-sale software. 

Square isn't the only mobile payments startup trying to be audacious. San Francisco's Stripe is thinking even more broadly--earlier this month, the company, which builds payments infrastructure for Web developers, announced it was launching a service that allows businesses to accept payments in 130 currencies.